One could also do something more carefully targeted like setting up an as-needed rebuild of the virtual map based on core system-wide pieces and per-user pieces gathered up from users' home directories. Security issues abound there, because you'd have to be validating the pieces to make sure that their scope is limited to the users' specific virtual space.
Yes, validation is an absolute requirement. Not only limited to their virtual space but limited to a particular syntax. Would-be hackers might experiment with unusual byte combinations to see what would happen during parsing. Of course, none of my users would ever think of doing that. Um, well, ahem...
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